Joyce Powell, 80, attends an exercise class at UT-Arlington with her husband, Thomas (right). Powell says she feels more confident in getting around and traveling since taking the classes. Dane Walters/KERA hide caption

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An ad for Vampt's Lean Machine "recovery ale," which will be marketed as a sports drink later this year, if funding allows. Researchers say drinking beer after working out has some advantages, but there are big caveats. Courtesy of VAMPT hide caption

itoggle caption Courtesy of VAMPT

The CDC would be happy with these guys, who were playing in Birmingham, Ala., in July 2013. Teenage boys say basketball is their favorite activity. Mark Almond/AL.COM /Landov hide caption

itoggle caption Mark Almond/AL.COM /Landov

Playing outside can help kids — and their parents — maintain a healthy weight. iStockphoto hide caption

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People practice yoga at a fundraiser for a breast cancer foundation in Hong Kong. Ed Jones/Getty Images hide caption

itoggle caption Ed Jones/Getty Images

He's not checking your blood glucose levels. He's playing Words with Friends. Anna Zielinska/iStockphoto.com hide caption

itoggle caption Anna Zielinska/iStockphoto.com